package com.heima.ai.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.heima.ai.pojo.ChatHistory;
import com.heima.ai.domain.vo.MessageVo;
import com.heima.ai.mapper.ChatHistoryMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.ai.chat.memory.ChatMemory;
import org.springframework.ai.chat.messages.Message;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.stream.Collectors;

@RequiredArgsConstructor
@RestController
@RequestMapping("/ai/history")
public class ChatHistoryController {

    private final ChatHistoryMapper chatHistoryMapper;

    private final ChatMemory chatMemory;

    /**
     * 查询会话历史列表
     *
     * @param type 业务类型，如：chat,service,pdf
     * @return chatId列表
     */
    @GetMapping("/{type}")
    public List<String> getChatIds(@PathVariable("type") String type) {
        LambdaQueryWrapper<ChatHistory> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ChatHistory::getType, type);
        return chatHistoryMapper.selectList(wrapper).stream().map(ChatHistory::getChatId).collect(Collectors.toList());
    }

    /**
     * 根据业务类型、chatId查询会话历史
     *
     * @param type   业务类型，如：chat,service,pdf
     * @param chatId 会话id
     * @return 指定会话的历史消息
     */
    @GetMapping("/{type}/{chatId}")
    public List<MessageVo> getChatHistory(@PathVariable("type") String type, @PathVariable("chatId") String chatId) {
        List<Message> messages = chatMemory.get(chatId, Integer.MAX_VALUE);
        if (messages == null) {
            return List.of();
        }
        return messages.stream().map(MessageVo::new).toList();
    }
}